ppt课件-passive optical network- d s p c s p(无源光网络- .pptx

ppt课件-passive optical network- d s p c s p(无源光网络- .pptx

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PassiveOpticalNetworksMay2007Yaakov(J)SteinandZvikaEitan

Outline2PONbenefitsPONarchitectureFiberopticbasicsPONphysicallayerPONuserplanePONcontrolplane

PONbenefits3

Whyfiber?today’shighdataratenetworksareallbasedonopticalfiberthereasonissimple (examplesfordemonstrationsake)twistedcopperpair(s)■8Mbps@3km, 1.5Mbps@5.5km (ADSL)1Gb@100meters(802.3ab)microwave70Mbps@ 30km(WiMax)coax10Mbps @3.6km (10BROAD36)30Mbps @30km (cablemodem)opticalfiber10Mbps @2km(10BASE-FL)100Mbps@400m(100BASE-FX)1Gbps @2km(1000BASE-LX)10Gbps@40(80)km(10GBASE-E(Z)R)40Gbps@700km[Nortel]or3000km[Verizon]4

Aside–whyisfiberbetter?5attenuationperunitlengthreasonsforenergylosscopper:resistance,skineffect,radiation,couplingfiber:internalscattering,imperfecttotalinternalreflectionsofiberbeatscoaxbyabout2ordersofmagnitudee.g.10dB/kmforthincoaxat50MHz,0.15dB/kml=1550nmfibernoiseingressandcross-talkcoppercouplestoallnearbyconductorsnosimilaringressmechanismforfiberground-potential,galvanicisolation,lightningprotectioncoppercanbehardtohandleanddangerousnoconcernsforfiber

Whynotfiber?fiberbeatsallothertechnologiesforspeedandreachbutfiberhasitsownproblemshardertosplice,repair,andneedtohandlecarefullyregeneratorsandevenamplifiersareproblematic – moreexpensivetodeploythanforcopperdigitalprocessingrequireselectronics – soneedtoconvertbacktoelectronicsswitchingeasierwithelectronics(butpossiblewithphotonics) – sopurefibernetworksaretopologicallylimited:point-to-pointringswewillcalltheconverteranopticaltransceivcoeprperopticaltransceiversareexpensive6fiber

Accessnetworkbottleneckhardforenduserstogethighdataratesbecauseoftheaccessbottlenecklocalareanetworksusecoppercablegethighdataratesovershortdistancescorenetworksusefiberopticsgethighdatarateoverlongdista

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